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#include <userspace.h>
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#include <userspace.h>
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#include <arch/pm.h>
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#include <arch/pm.h>
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#include <arch/types.h>
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#include <arch/types.h>
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#include <arch.h>
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#include <arch.h>
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#include <proc/thread.h>
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#include <proc/uarg.h>
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#include <mm/as.h>
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#include <mm/as.h>
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/** Enter userspace
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/** Enter userspace
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 *
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 *
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 * Change CPU protection level to 3, enter userspace.
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 * Change CPU protection level to 3, enter userspace.
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 *
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 *
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 */
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 */
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void userspace(uspace_arg_t *uarg)
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void userspace(uspace_arg_t *kernel_uarg)
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{
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{
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    ipl_t ipl;
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    ipl_t ipl;
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    ipl = interrupts_disable();
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    ipl = interrupts_disable();
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    __asm__ volatile (
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    __asm__ volatile (
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        /*
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         * Clear nested task flag.
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        /* CLNT */
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         */
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        "pushfl\n"
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        "pushfl\n"
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        "pop %%eax\n"
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        "pop %%eax\n"
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        "and $0xffffbfff,%%eax\n"
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        "and $0xffffbfff, %%eax\n"
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        "push %%eax\n"
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        "push %%eax\n"
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        "popfl\n"
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        "popfl\n"
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        "pushl %0\n"
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        "pushl %0\n"
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        "pushl %1\n"
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        "pushl %1\n"
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        "pushl %2\n"
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        "pushl %2\n"
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        "pushl %3\n"
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        "pushl %3\n"
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        "pushl %4\n"
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        "pushl %4\n"
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        "movl %5, %%eax\n"
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        "iret"
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        "iret"
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        :
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        :
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        : "i" (selector(UDATA_DES) | PL_USER), "r" (uarg->uspace_stack+THREAD_STACK_SIZE),
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        : "i" (selector(UDATA_DES) | PL_USER), "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE),
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          "r" (ipl), "i" (selector(UTEXT_DES) | PL_USER), "r" (uarg->uspace_entry)
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          "r" (ipl), "i" (selector(UTEXT_DES) | PL_USER), "r" (kernel_uarg->uspace_entry),
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          "r" (kernel_uarg->uspace_uarg)
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        : "eax");
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        : "eax");
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    /* Unreachable */
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    /* Unreachable */
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    for(;;)
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    for(;;)
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        ;
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        ;